Bluetooth pairing

I mean that bluetooth pairing one iPhone to another is not and never has been supported.

Again, what are you trying to accomplish?

Bluetooth pairing should not be required. All you have to do is be signed in with the same iCloud account on both devices for things like continuity and handoff to work. Transferring photos and documents can be done with Airdrop. "Pairing" is not required to do this.

Ashrafnorelden73 wrote:

But the message appears on both devices, so how do I know which of them is not supported?! I have never used bluetooth between devices before

Both of them. You can not pair an iOS device with another iOS device or with a computer.

Because that's not supported. It never has been. It shouldn't be necessary.

What are you trying to accomplish?